CN108690927A - The method that thermit reaction prepares diamond segment - Google Patents
The method that thermit reaction prepares diamond segment Download PDFInfo
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- CN108690927A CN108690927A CN201710230447.1A CN201710230447A CN108690927A CN 108690927 A CN108690927 A CN 108690927A CN 201710230447 A CN201710230447 A CN 201710230447A CN 108690927 A CN108690927 A CN 108690927A
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- Prior art keywords
- thermit reaction
- powder
- diamond segment
- diamond
- prepares
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Classifications
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C26/00—Alloys containing diamond or cubic or wurtzitic boron nitride, fullerenes or carbon nanotubes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/02—Compacting only
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/10—Sintering only
- B22F3/11—Making porous workpieces or articles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
- B22F2005/001—Cutting tools, earth boring or grinding tool other than table ware
Abstract
The present invention relates to a kind of methods that thermit reaction prepares diamond segment, belong to the technical field of diamond tool.The method that the thermit reaction of the present invention prepares diamond segment, be metallic bond is uniformly mixed with diamond, be cold-pressed obtain cutter head blank after experiencing free sintering form, and the metallic bond includes the thermit reaction powder obtained through cold conditions mixing and ball milling by iron powder and aluminium powder.The present invention is used can the exothermic cold conditions ball milling alfer powder of self- propagating during heat-agglomerating, it can be obtained fine and close and high hold diamond segment without pressure sintering, and since production efficiency can be substantially increased compared with prior art in continuous tunnel furnace without pressure dense sintering.
Description
Technical field
The present invention relates to the technical fields of diamond tool, it is more particularly related to prepared by a kind of thermit reaction
The method of diamond segment.
Background technology
In the prior art, welding metalloid bonding agent extra hard material product cutter head is all made of powder metallurgical production technique system
Standby, method is to be uniformly mixed metal powder with diamond abrasive grain, then cold moudling, hot pressing/pressureless sintering.Cold moudling
Two kinds of sintering production techniques of green body generally use:Most common is to add green body in graphite jig in pressing sintering over-assemble
Pressure sintering;Another is that green body is placed in continuous tunnel stove or bell-type furnace with reducing atmosphere to be freely sintered.This two
Energy is provided by external equipment completely needed for the kind mode of production, and cutter head performance is influenced pole by the variation of raw material and technological parameter
Greatly, the regulation and control difficulty of especially sharpness is larger.Hot-pressing sintering technique carcass is strong to the hold of diamond, long lifespan, but cutting edge of a knife or a sword
Sharp degree is limited, and high energy consumption, efficiency are low.Low energy consumption for free style sintering in continuous tunnel furnace or bell-type furnace, and efficiency is very high, but burns
Tie consistency and its to the hold of diamond limited, in cutting process diamond easy to fall off mistake of the green body under the conditions of no pressure
Effect, this be diamond composition non-pressure sintering technology institute generally existing technical barrier and pressureless sintering be difficult to promote and apply
Obstacle bottleneck, thus, fail commonly used in the industry.
In order to improve production efficiency and improve the product quality of diamond segment, and it is new to introduce new sin-tering mechanism exploitation
Material system, enhancing carcass consolidate hold to the contraction of diamond, are the active demands of diamond composition pressureless sintering technology.
Chinese invention patent application announces CN101342686A and discloses a kind of method that self propagating high temperature prepares diamond module, profit
Improve the hold between the diamond segment of nickel plating with the self-propagating reaction of TiCo or TiNi, but this method using
Rare and high valence Ti, Co and Ni powder, in order to ensure hold will also in advance to diamond carry out Nickel Plating Treatment, so as to cause at
This height, it is difficult to promote and apply.Chinese invention patent application, which announces CN103521774A and discloses a kind of self- propagating, prepares diamond
The method of locking nub tool, wherein using 40~70% Ni, 10~30% Al, 5~20% Cr, 5~25% Ti, 0~
5% Co, 0.5~1% Rare-Earth Ce alloy as bonding agent, wherein be utilized the self-propagating reaction of Ni and Al and utilize element
Cr and Ti elements improve the hold of carcass and diamond in enhanced primary treatments such as diamond surface formation Cr-C, Ti-C,
Wherein Ni, Cr, Ti etc. are of high cost, and are wherein swift in response and are easy to cause excessive hole, poor so as to cause its cutting ability,
It is relatively low to cut service life.Since the affinity of Al and Fe and diamond are poor, using the thermit reaction side of conventional aluminium and iron
It holds force difference to diamond segment prepared by method, and the service life for being particularly applied to Diamond Cutting cutter head only has conventional hot-press
The 1/3~1/5 of method, thus it is considered no practical application and use value.
Invention content
In order to reduce cost, improving production efficiency and overcome technical barrier in the prior art, of the invention provides one
The method that kind thermit reaction prepares diamond segment.
In order to achieve the above-mentioned object of the invention, present invention employs following technical schemes:
A kind of method that thermit reaction prepares diamond segment, metallic bond is uniformly mixed with diamond, is cold-pressed
Experiencing free sintering forms after obtaining cutter head blank, it is characterised in that:The metallic bond includes by iron powder and aluminium powder through cold
The thermit reaction powder that state mixing and ball milling obtains.
Wherein, in the metallic bond thermit reaction powder weight percent be 10~65wt%, preferably 20~
60wt%, more preferably 25~55wt%.
Wherein, the metallic bond include 10~65wt% thermit reaction powder and surplus selected from Fe, Cu, Sn and
At least one of Ni components.
Wherein, the content that Ti in Ti and Co or the metallic bond is substantially free of in the metallic bond is less than
The content of 0.5wt%, Co are less than 0.5wt%.
Wherein, the molar ratio of iron powder and aluminium powder is 3~5: 1, preferably 3: 1 in the thermit reaction powder.
Wherein, thermit reaction powder mixing and ball milling under -50 DEG C of low temperature environments below obtains.
Wherein, the compacted density of the blank is 50% or more of theoretical density, preferably 55% or more.
Wherein, the pressure of cold pressing is 30~100MPa.
Wherein, the diamond segment is used for grinding tool and/or cutting element.
Compared with the immediate prior art, the method tool of the present invention for preparing thermit reaction and preparing diamond segment
There is following advantageous effect:
The present invention use during heat-agglomerating can exothermic cold conditions ball milling alfer powder, be not necessarily to pressure sintering
Obtain fine and close and high hold diamond segment, and due to can be in continuous tunnel furnace without pressure dense sintering, with prior art phase
Than substantially increasing production efficiency.
Description of the drawings
Fig. 1 is schematic diagram of the diamond segment blank without pressure row sintering in continuous tunnel furnace.
Fig. 2 is the dimensional structure diagram of diamond segment blank prepared by the present invention.
Specific implementation mode
The method for preparing diamond segment to the thermit reaction of the present invention below with reference to specific embodiment is done further
It illustrates, to make more complete and clear explanation to technical scheme of the present invention.
The present invention provides a kind of methods that thermit reaction prepares diamond segment, the technical scheme is that in tradition
Metal adhesive formula system in introduce thermit reaction powder (Al-Fe self- propagatings component), formed using its self-propagating reaction
The exothermic effect generated in the bonding process of FeAl intermetallic compounds provides internal sintering energy for carcass metal.And this
The inventor of invention it is surprisingly found that can not only reduce the sintering temperature of system using the thermit reaction powder of cold conditions ball milling, but also
The free sintering densification of carcass can be remarkably promoted, even if so that prefabricated diamond segment green body is without pressure shape
It is sintered under state, it is also possible to obtain be similar to the compactness and service life of pressure sintering.
As one, unlimitedly example, thermit reaction of the present invention prepare the key step of diamond segment such as
Under:
By fine granularity aluminium powder (grain size≤10 μm) and carbonyl iron dust by 1: 3 molar ratio under inert atmosphere protection cold conditions (-
50 DEG C hereinafter, can utilize liquid nitrogen, dry ice etc. to control ball mill below defined temperature) mixing and ball milling, ratio of grinding media to material be (8~
10): 1, Ball-milling Time is 8~24 hours.
The feeding in inert protective atmosphere, 2 μm of discharging-material size <.By obtained thermit reaction powder by formula rate with it is other
Metal powder and diamond abrasive grain mix 1.5-2.5 hours, after mixing, charging in the round mixing tank filled with nitrogen
In automatic cold press hopper, to green body design size, the compacted density of blank is usually theoretical close for cold moudling in punching block
50% or more of degree.
As example as shown in Figure 1, it will be cold-pressed during the arrangement of green body 30 is assembled on the graphite septum 20 of bracket die 10
It is freely sintered in continuous tunnel furnace or bell-type furnace, sintering temperature is 750~850 DEG C, and sintering time is 15~60 minutes, after sintering in stove
Slow cooling is to room temperature.
Thermit reaction powder is prepared by the following method to obtain below in an example:
By fine granularity aluminium powder (grain size≤10 μm) and carbonyl iron dust by 1: 3 molar ratio the cold conditions under inert atmosphere protection
(- 100 DEG C of liquid nitrogen or less) mixing and ball milling, ratio of grinding media to material 8: 1, Ball-milling Time are 12 hours.
Embodiment 1
Using the iron powder of 42 parts by weight, the glass putty of the copper powder of 23 parts by weight, the thermit reaction powder of 30 parts by weight, 2 parts by weight
A diameter of 350mm granite saw blade is prepared with the formula system of the nickel powder of 3 parts by weight.Wherein, copper powder and the mist that glass putty is 400 mesh
Change powder, iron powder and nickel powder are carbonyl dust.Cold moudling is to green body design size, base in the punching block of automatic cold press hopper
The compacted density of material is the 60% of theoretical density, and preparation specification is the cold pressing knife of 40mm (length) × 15mm (height) × 3.2mm (thickness)
(its surface structure is as shown in Fig. 2, wherein a concentration of 26%) of diamond volume for head green body.It is freely sintered in continuous tunnel furnace, highest
830 DEG C of sintering temperature, sintering time are 30 minutes.The true porosity of cutter head is about 12%, and average hardness HRB is 96, average
Bending strength is 750MPa.Cutter head will be fired to be brazed on steel substrate, prepare finished product saw blade.Saw blade is cut loaded on automatic bridge-type
Three flower (medium hardness granite) planks that cutting thickness is 20mm on machine, water cooling cutting.The average cutting speed of saw blade is
8.1m/min, cutting life are 167 meters.
Embodiment 2
Using the iron powder of 8 parts by weight, the copper powder of 25 parts by weight, the thermit reaction powder of 60 parts by weight, 2 parts by weight glass putty and
The formula system of the nickel powder of 5 parts by weight prepares a diameter of 350mm granite saw blade.Wherein, copper powder and the atomization that glass putty is 400 mesh
Powder, iron powder and nickel powder are carbonyl dust.Cold moudling is to green body design size, blank in the punching block of automatic cold press hopper
Compacted density be theoretical density 60%, preparations specification for 40mm (length) × 15mm (height) × 3.2mm (thickness) cold pressing cutter head
(its surface structure is as shown in Fig. 2, wherein a concentration of 26%) of diamond volume for green body.It is freely sintered in continuous tunnel furnace, most high fever
830 DEG C of junction temperature, sintering time are 20 minutes.The true porosity of cutter head is about 11%, and average hardness HRB is 93, average anti-
Curved intensity is 755MPa.Cutter head will be fired to be brazed on steel substrate, prepare finished product saw blade.Saw blade is loaded on automatic bridge cutting machine
Three flower (medium hardness granite) planks that upper cutting thickness is 20mm, water cooling cutting.The average cutting speed of saw blade is 7.6m/
Min, cutting life are 161 meters.
Embodiment 3
Using the iron powder of 50 parts by weight, the glass putty of the copper powder of 20 parts by weight, the thermit reaction powder of 20 parts by weight, 3 parts by weight
A diameter of 350mm granite saw blade is prepared with the formula system of the nickel powder of 7 parts by weight.Wherein, copper powder and the mist that glass putty is 400 mesh
Change powder, iron powder and nickel powder are carbonyl dust.Cold moudling is to green body design size, base in the punching block of automatic cold press hopper
The compacted density of material is the 60% of theoretical density, and preparation specification is the cold pressing knife of 40mm (length) × 15mm (height) × 3.2mm (thickness)
(its surface structure is as shown in Fig. 2, wherein a concentration of 26%) of diamond volume for head green body.It is freely sintered in continuous tunnel furnace, highest
830 DEG C of sintering temperature, sintering time are 60 minutes.The true porosity of cutter head is about 12%, and average hardness HRB is 95, average
Bending strength is 770MPa.Cutter head will be fired to be brazed on steel substrate, prepare finished product saw blade.Saw blade is cut loaded on automatic bridge-type
Three flower (medium hardness granite) planks that cutting thickness is 20mm on machine, water cooling cutting.The average cutting speed of saw blade is
8.5m/min, cutting life are 163 meters.
Thermit reaction powder is prepared by the following method to obtain in comparative example below:
By fine granularity aluminium powder (grain size≤10 μm) and carbonyl iron dust by 1: 3 molar ratio under inert atmosphere protection in room temperature
Lower mixing and ball milling, ratio of grinding media to material 8: 1, Ball-milling Time are 30 minutes.
Comparative example 1
Using the iron powder of 42 parts by weight, the glass putty of the copper powder of 23 parts by weight, the thermit reaction powder of 30 parts by weight, 2 parts by weight
A diameter of 350mm granite saw blade is prepared with the formula system of the nickel powder of 3 parts by weight.Wherein, copper powder and the mist that glass putty is 400 mesh
Change powder, iron powder and nickel powder are carbonyl dust.Cold moudling is to green body design size, base in the punching block of automatic cold press hopper
The compacted density of material is the 60% of theoretical density, and preparation specification is the cold pressing knife of 40mm (length) × 15mm (height) × 3.2mm (thickness)
(its surface structure is as shown in Fig. 2, wherein a concentration of 26%) of diamond volume for head green body.It is freely sintered in continuous tunnel furnace, highest
830 DEG C of sintering temperature, sintering time are 30 minutes.The true porosity of cutter head is about 18%, and average hardness HRB is 92, average
Bending strength is 690MPa.Cutter head will be fired to be brazed on steel substrate, prepare finished product saw blade.Saw blade is cut loaded on automatic bridge-type
Three flower (medium hardness granite) planks that cutting thickness is 20mm on machine, water cooling cutting.The average cutting speed of saw blade is
7.9m/min, cutting life are 132 meters.
Comparative example 2
Using the iron powder of 8 parts by weight, the copper powder of 25 parts by weight, the thermit reaction powder of 60 parts by weight, 2 parts by weight glass putty and
The formula system of the nickel powder of 5 parts by weight prepares a diameter of 350mm granite saw blade.Wherein, copper powder and the atomization that glass putty is 400 mesh
Powder, iron powder and nickel powder are carbonyl dust.Cold moudling is to green body design size, blank in the punching block of automatic cold press hopper
Compacted density be theoretical density 60%, preparations specification for 40mm (length) × 15mm (height) × 3.2mm (thickness) cold pressing cutter head
(its surface structure is as shown in Fig. 2, wherein a concentration of 26%) of diamond volume for green body.It is freely sintered in continuous tunnel furnace, most high fever
830 DEG C of junction temperature, sintering time are 20 minutes.The true porosity of cutter head is about 19%, and average hardness HRB is 88, average anti-
Curved intensity is 690MPa.Cutter head will be fired to be brazed on steel substrate, prepare finished product saw blade.Saw blade is loaded on automatic bridge cutting machine
Three flower (medium hardness granite) planks that upper cutting thickness is 20mm, water cooling cutting.The average cutting speed of saw blade is 7.5m/
Min, cutting life are 133 meters.
Comparative example 3
Using the iron powder of 50 parts by weight, the glass putty of the copper powder of 20 parts by weight, the thermit reaction powder of 20 parts by weight, 3 parts by weight
A diameter of 350mm granite saw blade is prepared with the formula system of the nickel powder of 7 parts by weight.Wherein, copper powder and the mist that glass putty is 400 mesh
Change powder, iron powder and nickel powder are carbonyl dust.Cold moudling is to green body design size, base in the punching block of automatic cold press hopper
The compacted density of material is the 60% of theoretical density, and preparation specification is the cold pressing knife of 40mm (length) × 15mm (height) × 3.2mm (thickness)
(its surface structure is as shown in Fig. 2, wherein a concentration of 26%) of diamond volume for head green body.It is freely sintered in continuous tunnel furnace, highest
830 DEG C of sintering temperature, sintering time are 60 minutes.The true porosity of cutter head is about 21%, and average hardness HRB is 95, average
Bending strength is 770MPa.Cutter head will be fired to be brazed on steel substrate, prepare finished product saw blade.Saw blade is cut loaded on automatic bridge-type
Three flower (medium hardness granite) planks that cutting thickness is 20mm on machine, water cooling cutting.The average cutting speed of saw blade is
8.1m/min, cutting life are 128 meters.
For the ordinary skill in the art, specific embodiment is only exemplarily described the present invention,
Obviously the present invention specific implementation is not subject to the restrictions described above, as long as use the inventive concept and technical scheme of the present invention into
The improvement of capable various unsubstantialities, or it is not improved by the present invention design and technical solution directly apply to other occasions
, within protection scope of the present invention.
Claims (10)
1. metallic bond is uniformly mixed with diamond, is cold-pressed by a kind of method that thermit reaction prepares diamond segment
Experiencing free sintering forms after to cutter head blank, it is characterised in that:The metallic bond includes by iron powder and aluminium powder through cold conditions
The thermit reaction powder that mixing and ball milling obtains.
2. the method that thermit reaction according to claim 1 prepares diamond segment, it is characterised in that:The metal combines
The weight percent of thermit reaction powder is 10~65wt% in agent.
3. the method that thermit reaction according to claim 1 prepares diamond segment, it is characterised in that:The metal combines
Agent include 10~65wt% thermit reaction powder and surplus selected from least one of Fe, Cu, Sn and Ni component.
4. the method that thermit reaction according to claim 3 prepares diamond segment, it is characterised in that:The metal combines
The content that Ti in Ti and Co or the metallic bond is substantially free of in agent is less than 0.5wt%, and the content of Co is less than
0.5wt%.
5. the method that thermit reaction according to claim 1 prepares diamond segment, it is characterised in that:The thermit reaction
The molar ratio of iron powder and aluminium powder is 3~5: 1 in powder.
6. the method that thermit reaction according to claim 1 prepares diamond segment, it is characterised in that:The thermit reaction
Powder mixing and ball milling under -100 DEG C of low temperature environments below obtains.
7. the method that thermit reaction according to claim 1 prepares diamond segment, it is characterised in that:The pressure of the blank
Real density is 50% or more of theoretical density.
8. the method that thermit reaction according to claim 1 prepares diamond segment, it is characterised in that:The pressure of cold pressing is
30~100MPa.
9. the method that thermit reaction according to claim 1 prepares diamond segment, it is characterised in that:The diamond tool
Head is used for grinding tool and/or cutting element.
10. a kind of diamond segment, it is characterised in that:Diamond is prepared by claim 1~9 any one of them thermit reaction
The method of cutter head is prepared.
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| CN201710230447.1A CN108690927A (en) | 2017-04-10 | 2017-04-10 | The method that thermit reaction prepares diamond segment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201710230447.1A CN108690927A (en) | 2017-04-10 | 2017-04-10 | The method that thermit reaction prepares diamond segment |
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| CN108690927A true CN108690927A (en) | 2018-10-23 |
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ID=63843286
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| CN201710230447.1A Pending CN108690927A (en) | 2017-04-10 | 2017-04-10 | The method that thermit reaction prepares diamond segment |
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105039824A (en) * | 2015-06-25 | 2015-11-11 | 安泰科技股份有限公司 | Circular diamond saw blade bit and manufacturing method thereof |
-
2017
- 2017-04-10 CN CN201710230447.1A patent/CN108690927A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105039824A (en) * | 2015-06-25 | 2015-11-11 | 安泰科技股份有限公司 | Circular diamond saw blade bit and manufacturing method thereof |
Non-Patent Citations (2)
| Title |
|---|
| 刘万辉等: "《复合材料》", 31 August 2011, 哈尔滨工业大学出版社 * |
| 方啸虎: "《超硬材料科学与技术 上》", 30 April 1998, 中国建材工业出版社 * |
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